US6821055B2 - Marine buoyancy modules and units - Google Patents
Marine buoyancy modules and units Download PDFInfo
- Publication number
- US6821055B2 US6821055B2 US10/244,395 US24439502A US6821055B2 US 6821055 B2 US6821055 B2 US 6821055B2 US 24439502 A US24439502 A US 24439502A US 6821055 B2 US6821055 B2 US 6821055B2
- Authority
- US
- United States
- Prior art keywords
- unit
- reinforcement layer
- sections
- riser
- unit according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000002787 reinforcement Effects 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 229920001944 Plastisol Polymers 0.000 claims description 2
- 230000000295 complement effect Effects 0.000 claims description 2
- 239000004999 plastisol Substances 0.000 claims description 2
- 239000006260 foam Substances 0.000 abstract description 9
- 239000000805 composite resin Substances 0.000 abstract description 2
- 229920001187 thermosetting polymer Polymers 0.000 abstract description 2
- 229920005594 polymer fiber Polymers 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 10
- 239000010410 layer Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 244000198134 Agave sisalana Species 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 229920005570 flexible polymer Polymers 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
- B63B43/02—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking
- B63B43/10—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving buoyancy
- B63B43/14—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving buoyancy using outboard floating members
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
- E21B17/012—Risers with buoyancy elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/12—Laying or reclaiming pipes on or under water
- F16L1/20—Accessories therefor, e.g. floats, weights
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B2231/00—Material used for some parts or elements, or for particular purposes
- B63B2231/40—Synthetic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B2231/00—Material used for some parts or elements, or for particular purposes
- B63B2231/40—Synthetic materials
- B63B2231/50—Foamed synthetic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B2231/00—Material used for some parts or elements, or for particular purposes
- B63B2231/70—Glass
- B63B2231/72—Hollow glass microspheres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B59/00—Hull protection specially adapted for vessels; Cleaning devices specially adapted for vessels
- B63B59/02—Fenders integral with waterborne vessels or specially adapted therefor, e.g. fenders forming part of the hull or incorporated in the hull; Rubbing-strakes
Definitions
- the present invention is concerned with units and modules used primarily to impart buoyancy to marine objects and secondarily to protect such objects.
- Exploration drilling is increasingly taking place in areas of high ocean currents and deep water.
- the suspended weight of the drill string affects the stability of the drillship.
- the weight also potentially exceeds the tensile strength of the riser string so the majority of the submerged weight of the drill string needs to be balanced off by use of strap on buoyancy modules fabricated from low-density syntactic foam.
- the clad riser is also subject to subsurface loop currents. These currents cause significant flexure of the riser joint, with these flexural forces being directly transferred to the buoyancy modules.
- Deep-water tolerant, minimum density syntactic foam requires the use of very rigid and therefore relatively brittle resin matrices for the syntactic. It is not commercially of practically viable to utilise flexible, resilient materials. Therefore as relatively brittle materials must be used, there is a requirement for drilling riser modules to incorporate some means whereby the overall structural integrity of the riser module is retained, even after the module has suffered substantial cracking and fracture.
- An object of the invention is to provide an improved construction for marine buoyancy units and modules.
- a marine buoyancy unit composed of synthetic plastics material and having an internal cavity for surrounding one or more elongate objects and a mechanically embedded reinforcement layer close to the outermost surface remote from the cavity.
- a marine buoyancy unit composed of syntactic foam and having an internal cavity for surrounding one or more elongate objects and a mechanically embedded reinforcement layer close to the outermost surface remote from the cavity. It has been found that a layer of fibres near the surface maintains residual structural integrity, yet is light enough not to materially affect buoyancy and does not create any new safety hazard.
- the fibres are high strength polymer fibres.
- the unit is cylindrical and the layer of fibres is installed on the outward facing curvature of the unit and may advantageously be installed in the areas of the choke and kill lines of the module flats.
- the fibres are made of tough, rather than brittle material and that they possesses significant elongation at break. This elongation performance may be inherent in the fibre e.g. PE, PP, Nylon, Polycarbonate, PET, PE/PP, copolymers or may be achieved in fibres with lower elongation at break by twisting into ropes e.g., “Kevlar” (RTM).
- the fibres, which make up the layers are mechanically locked into place within the syntactic foam but should not be tightly bonded in order to allow some limited axial movement in the event of fracture. This is readily achieved by a mesh configuration.
- the use of a mesh produced from bi-directional bunches of linear fibres embedded in flexible polymer sheathing to which the epoxy syntactic will not bond is preferable.
- the mesh is mechanically locked into, rather than bonded to the syntactic foam, it is advantageous but not essential if this mesh is positioned slightly subsurface, preferable 5-25 mm in order to prevent it peeling off the surface after module fracture.
- This subsurface positioning may be achieved by the use of a thick, open structure lattice material, such as the “Enkamat” mesh system from Colbond (icosynthetics Inc of Enka, N.C., USA.
- the retention system may advantageously be attached to the open structured spacer material, so that it is positioned in the product when the spacer material is attached to the mold.
- the material In selecting the reinforcing fibre the material is requires to be able to tolerate the temperature conditions achieved during product cure, typically a maximum of 150° C. and also be resistant to degradation in the marine environment. This latter requirement precludes the use of natural fibres such as hemp and sisal, unless they are encapsulated in a water impervious coating.
- a material identified as particularly suitable for the reinforcing fibre is the “Sympaforce” range of geogrids, manufactured by Synteen Technical fibres Inc of Lancaster, S.C., USA and Synteen GmbH of Klettgau-Erzingen, Germany. This is a high tenicity PET mesh bonded and encapsulated in PVC “plastisol” paste. Mesh weights between 100 g/m 2 and 750/m 2 may be used; with mesh weight being selected to suit the anticipated maximum weight. Meshes with weight and tensile strength biased in the axial direction are preferred, with grades of axial strength of 50-200 kN/m and transverse/circumferential strength of 25-100 kN/m being particularly suitable.
- the high strength fibre mesh retains all sections of the broken module in nominally the original position. Broken sections are prevented from dropping off the main body of the module, allowing the drilling operation to continue uninterrupted.
- the broken module can be removed and replaced when production operation allow, typically at the end of the drilling campaign when the riser string is lifted and stored on deck or onshore.
- FIG. 1 is and end view of a marine buoyancy modular unit constructed in accordance with the invention.
- FIG. 2 is a separate view of the structural integrity reinforcement mesh embedded in the unit shown in FIG. 1 .
- a marine buoyancy unit 10 of elongated cylindrical form is composed of two complementary sections 2 , 3 joined together and separable from one another along a central axial plane 4 .
- the sections 2 , 3 collectively define an internal cavity 5 with a shape determined by the marine object on which the unit 10 is to be fitted.
- the cavity 5 is defined by the inner bore surface of circular cross section designed to mate with a sub sea riser but as depicted the cavity 5 can have a shape conforming with pipeline 12 surrounded by a group of further lines or conduits 13 .
- the sections 2 , 3 collectively define an outer peripheral surface 14 . Normally a series of such units 10 would be arranged end-to-end at least partially to enclose the marine object to be protected and to impart buoyancy thereto.
- the sections 2 , 3 of each unit 10 may be held together in a variety of ways, for example, flexible bands (not shown) can be wrapped around the sections 2 , 3 or the sections 2 , 3 can be shaped to lock together, or alternatively bolted together.
- the sections 2 , 3 making up the unit 10 are typically fabricated from a thermosetting resin composites, such as epoxy and thermoplastic composites may be used especially such composites with a syntactic foam interior and an outer layer with suitable high performance quality for use in marine applications.
- a thermosetting resin composites such as epoxy and thermoplastic composites may be used especially such composites with a syntactic foam interior and an outer layer with suitable high performance quality for use in marine applications.
- the radially outermost region of the unit 10 is reinforced by means of a residual structural integrity reinforcement 6 , which is mechanically locked into the unit 10 .
- the reinforcement 6 takes the form of an internal layer close to the outer surface layer preferably 5-25 mm from the outer surface 14 .
- the reinforcement 6 can take the form of fibres which can be arranged as a flexible mesh 7 such as “Sympaforce” incorporated in the sections 2 , 3 just below the outer surface 14 of unit 10 .
- FIG. 2 shows a configuration of a preferred embodiment of mesh structure 7 .
- a number of high strength polymer main strips of fibres 21 running substantially parallel to each other are interconnected with smaller interconnecting fibre strips 23 running perpendicularly to the main strips 21 .
- the mesh structure 7 can be bent into an arc when the sections 2 , 3 are moulded to become embedded and mechanically locked into the unit 10 .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Ocean & Marine Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Combustion & Propulsion (AREA)
- Laminated Bodies (AREA)
- Revetment (AREA)
- Earth Drilling (AREA)
Abstract
Description
Claims (6)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0122417 | 2001-09-17 | ||
GB0122417.9 | 2001-09-17 | ||
GB0122417A GB2379681A (en) | 2001-09-17 | 2001-09-17 | Marine buoyancy unit |
Publications (2)
Publication Number | Publication Date |
---|---|
US20030068941A1 US20030068941A1 (en) | 2003-04-10 |
US6821055B2 true US6821055B2 (en) | 2004-11-23 |
Family
ID=9922217
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/244,395 Expired - Fee Related US6821055B2 (en) | 2001-09-17 | 2002-09-17 | Marine buoyancy modules and units |
Country Status (2)
Country | Link |
---|---|
US (1) | US6821055B2 (en) |
GB (1) | GB2379681A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040266290A1 (en) * | 2001-09-15 | 2004-12-30 | Robert Gibson | Buoyancy element and module |
US20060231150A1 (en) * | 2005-04-14 | 2006-10-19 | Halliburton Energy Services, Inc. | Methods and apparatus to reduce heat transfer from fluids in conduits |
US20090209352A1 (en) * | 2008-02-14 | 2009-08-20 | David William Dartford | Energy managing keel joint |
US20090272855A1 (en) * | 2008-05-02 | 2009-11-05 | Balmoral Comtec Limited | Device |
US7628665B1 (en) * | 2007-10-26 | 2009-12-08 | Flotation Technologies, Inc. | Drilling riser buoyancy modules |
WO2010053447A1 (en) * | 2008-11-06 | 2010-05-14 | Dynaglass Reinforced Plastic Pte Ltd | Drill riser buoyancy modules |
US20110017516A1 (en) * | 2009-07-27 | 2011-01-27 | Eric Gollmyer | Non-rotating buoyancy modules for sub-sea conduits |
US20160230475A1 (en) * | 2015-02-06 | 2016-08-11 | Cuming Corporation | Synatic foam design modifications |
US9512685B2 (en) * | 2014-08-19 | 2016-12-06 | Schlumberger Technology Corporation | Cable protector system |
US11404854B2 (en) | 2017-06-21 | 2022-08-02 | C-Ling Limited | Pull-in head assembly |
US11411376B2 (en) | 2017-06-21 | 2022-08-09 | C-Ling Limited | Pull-in head assembly |
US11418016B2 (en) | 2017-06-21 | 2022-08-16 | C-Ling Limited | Pull-in head assembly |
US11473563B2 (en) | 2016-09-28 | 2022-10-18 | C-Ling Limited | Annular seal member locatable against a wall element of an offshore structure |
US12071926B2 (en) | 2016-09-28 | 2024-08-27 | C-Ling Limited | Apparatus |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7070361B2 (en) * | 2003-03-06 | 2006-07-04 | Shell Oil Company | Apparatus and methods for providing VIV suppression to a riser system comprising umbilical elements |
ITPD20070001A1 (en) | 2007-01-02 | 2008-07-03 | Stefano Malagodi | DEPTH BUOY FOR MARITIME APPLICATIONS AND PROCEDURE FOR ITS REALIZATION |
ITMI20080269A1 (en) * | 2008-02-20 | 2009-08-21 | Valore Italia S R L | PERFECT FLOATING DEVICE FOR PIPES |
CN101638887B (en) * | 2009-08-21 | 2011-05-11 | 盘锦新永成塑胶有限公司 | Foamed hollow plastic fender product and production method |
IT1399696B1 (en) * | 2010-04-14 | 2013-04-26 | Soilmec Spa | GUIDE DEVICE FOR FLEXIBLE PIPES AND CABLES. |
US8721222B2 (en) | 2011-11-04 | 2014-05-13 | Chevron U.S.A. Inc. | Lateral buckling mitigation apparatus, methods and systems for use with subsea conduits |
CN107002469B (en) | 2014-10-10 | 2020-01-24 | 伊特里克公司 | A marine riser section for subsea wellbore related operations |
BR102015027544B1 (en) * | 2015-10-29 | 2022-07-19 | IPB-GR Indústria Mecânica Ltda. | FLOAT FOR INSTALLATION OF SUBSEA EQUIPMENT |
GB201712940D0 (en) | 2017-08-11 | 2017-09-27 | Balmoral Comtec Ltd | Material |
US10371288B1 (en) | 2018-10-22 | 2019-08-06 | Chevron U.S.A. Inc. | Apparatus and method for reducing impact of stresses on a subsea pipeline |
Citations (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3773090A (en) | 1971-02-12 | 1973-11-20 | Pirelli | Buoyant hose and method for making same |
US4477207A (en) * | 1982-08-26 | 1984-10-16 | Johnson Arne I | Marine riser buoyancy assembly |
US4505617A (en) * | 1979-10-12 | 1985-03-19 | National Research Development Corporation | Stabilizing bluff structures against oscillation |
US4634314A (en) * | 1984-06-26 | 1987-01-06 | Vetco Offshore Inc. | Composite marine riser system |
US4768455A (en) * | 1983-01-07 | 1988-09-06 | Conoco Inc. | Dual wall steel and fiber composite mooring element for deep water offshore structures |
EP0375118A2 (en) * | 1988-09-30 | 1990-06-27 | WYATT, Roy | Improvements in or relating to couplings for reducing the transfer of vibration forces |
US5165821A (en) * | 1991-08-21 | 1992-11-24 | Minnesota Mining And Manufacturing Co. | Oil-sorbing boom |
US5195843A (en) * | 1991-05-30 | 1993-03-23 | Minnesota Mining And Manufacturing Company | Ceramic foam body having closed cell structure |
US5226751A (en) * | 1992-02-04 | 1993-07-13 | Doleshal Donald L | Controlling the environment around a submerged pile or other structures by encapsulation, and treating and repairing the encapsulation area |
US5722794A (en) | 1994-07-02 | 1998-03-03 | Phoenix Aktiengesellschaft | Float for floating flexible pipes |
US5875728A (en) * | 1994-03-28 | 1999-03-02 | Shell Oil Company | Spar platform |
US6004074A (en) * | 1998-08-11 | 1999-12-21 | Mobil Oil Corporation | Marine riser having variable buoyancy |
US6030145A (en) | 1997-12-10 | 2000-02-29 | Lucent Technologies Inc. | Articulated underwater cable riser system |
US6155748A (en) | 1999-03-11 | 2000-12-05 | Riser Systems Technologies | Deep water riser flotation apparatus |
US6199595B1 (en) * | 1998-06-04 | 2001-03-13 | Jerry G. Baker | Insulated marine pipe apparatus and method of installation |
US6213157B1 (en) | 1997-10-10 | 2001-04-10 | Doris Engineering | Submarine pipeline for transporting petroleum products |
US6435775B1 (en) * | 2000-05-22 | 2002-08-20 | Edo Corporation, Fiber Science Division | Buoyancy system with buoyancy module seal |
US20020115365A1 (en) * | 2000-11-30 | 2002-08-22 | Aker Maritime, Inc.; | Buoyancy module with external frame |
US6457527B2 (en) * | 1998-03-17 | 2002-10-01 | Granville Louis Wells | Apparatus and method for adding buoyancy to riser with inflatable floatation collar |
US6551029B2 (en) * | 2000-01-31 | 2003-04-22 | Hongbo Shu | Active apparatus and method for reducing fluid induced stresses by introduction of energetic flow into boundary layer around an element |
-
2001
- 2001-09-17 GB GB0122417A patent/GB2379681A/en not_active Withdrawn
-
2002
- 2002-09-17 US US10/244,395 patent/US6821055B2/en not_active Expired - Fee Related
Patent Citations (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3773090A (en) | 1971-02-12 | 1973-11-20 | Pirelli | Buoyant hose and method for making same |
US4505617A (en) * | 1979-10-12 | 1985-03-19 | National Research Development Corporation | Stabilizing bluff structures against oscillation |
US4477207A (en) * | 1982-08-26 | 1984-10-16 | Johnson Arne I | Marine riser buoyancy assembly |
US4768455A (en) * | 1983-01-07 | 1988-09-06 | Conoco Inc. | Dual wall steel and fiber composite mooring element for deep water offshore structures |
US4634314A (en) * | 1984-06-26 | 1987-01-06 | Vetco Offshore Inc. | Composite marine riser system |
EP0375118A2 (en) * | 1988-09-30 | 1990-06-27 | WYATT, Roy | Improvements in or relating to couplings for reducing the transfer of vibration forces |
US5195843A (en) * | 1991-05-30 | 1993-03-23 | Minnesota Mining And Manufacturing Company | Ceramic foam body having closed cell structure |
US5165821A (en) * | 1991-08-21 | 1992-11-24 | Minnesota Mining And Manufacturing Co. | Oil-sorbing boom |
US5226751A (en) * | 1992-02-04 | 1993-07-13 | Doleshal Donald L | Controlling the environment around a submerged pile or other structures by encapsulation, and treating and repairing the encapsulation area |
US5875728A (en) * | 1994-03-28 | 1999-03-02 | Shell Oil Company | Spar platform |
US5722794A (en) | 1994-07-02 | 1998-03-03 | Phoenix Aktiengesellschaft | Float for floating flexible pipes |
US6213157B1 (en) | 1997-10-10 | 2001-04-10 | Doris Engineering | Submarine pipeline for transporting petroleum products |
US6030145A (en) | 1997-12-10 | 2000-02-29 | Lucent Technologies Inc. | Articulated underwater cable riser system |
US6457527B2 (en) * | 1998-03-17 | 2002-10-01 | Granville Louis Wells | Apparatus and method for adding buoyancy to riser with inflatable floatation collar |
US6199595B1 (en) * | 1998-06-04 | 2001-03-13 | Jerry G. Baker | Insulated marine pipe apparatus and method of installation |
US6004074A (en) * | 1998-08-11 | 1999-12-21 | Mobil Oil Corporation | Marine riser having variable buoyancy |
US6155748A (en) | 1999-03-11 | 2000-12-05 | Riser Systems Technologies | Deep water riser flotation apparatus |
US6551029B2 (en) * | 2000-01-31 | 2003-04-22 | Hongbo Shu | Active apparatus and method for reducing fluid induced stresses by introduction of energetic flow into boundary layer around an element |
US6435775B1 (en) * | 2000-05-22 | 2002-08-20 | Edo Corporation, Fiber Science Division | Buoyancy system with buoyancy module seal |
US20020115365A1 (en) * | 2000-11-30 | 2002-08-22 | Aker Maritime, Inc.; | Buoyancy module with external frame |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7214114B2 (en) * | 2001-09-15 | 2007-05-08 | Trelleborg Crp Ltd. | Buoyancy element and module |
US20080017385A1 (en) * | 2001-09-15 | 2008-01-24 | Robert Gibson | Buoyancy element and module |
US20040266290A1 (en) * | 2001-09-15 | 2004-12-30 | Robert Gibson | Buoyancy element and module |
US20060231150A1 (en) * | 2005-04-14 | 2006-10-19 | Halliburton Energy Services, Inc. | Methods and apparatus to reduce heat transfer from fluids in conduits |
US7628665B1 (en) * | 2007-10-26 | 2009-12-08 | Flotation Technologies, Inc. | Drilling riser buoyancy modules |
US7766580B2 (en) * | 2008-02-14 | 2010-08-03 | National Oilwell Varco, L.P. | Energy managing keel joint |
US20090209352A1 (en) * | 2008-02-14 | 2009-08-20 | David William Dartford | Energy managing keel joint |
US20090272855A1 (en) * | 2008-05-02 | 2009-11-05 | Balmoral Comtec Limited | Device |
WO2010053447A1 (en) * | 2008-11-06 | 2010-05-14 | Dynaglass Reinforced Plastic Pte Ltd | Drill riser buoyancy modules |
US20110017516A1 (en) * | 2009-07-27 | 2011-01-27 | Eric Gollmyer | Non-rotating buoyancy modules for sub-sea conduits |
US8800664B2 (en) | 2009-07-27 | 2014-08-12 | Wwt North America Holdings, Inc. | Non-rotating buoyancy modules for sub-sea conduits |
US9512685B2 (en) * | 2014-08-19 | 2016-12-06 | Schlumberger Technology Corporation | Cable protector system |
US20160230475A1 (en) * | 2015-02-06 | 2016-08-11 | Cuming Corporation | Synatic foam design modifications |
US11473563B2 (en) | 2016-09-28 | 2022-10-18 | C-Ling Limited | Annular seal member locatable against a wall element of an offshore structure |
US12071926B2 (en) | 2016-09-28 | 2024-08-27 | C-Ling Limited | Apparatus |
US11404854B2 (en) | 2017-06-21 | 2022-08-02 | C-Ling Limited | Pull-in head assembly |
US11411376B2 (en) | 2017-06-21 | 2022-08-09 | C-Ling Limited | Pull-in head assembly |
US11418016B2 (en) | 2017-06-21 | 2022-08-16 | C-Ling Limited | Pull-in head assembly |
Also Published As
Publication number | Publication date |
---|---|
GB0122417D0 (en) | 2001-11-07 |
GB2379681A (en) | 2003-03-19 |
US20030068941A1 (en) | 2003-04-10 |
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